// Expand sRGB gamma curve. vec4 FUNCNAME(vec2 tc) { vec4 x = LAST_INPUT(tc); x.r = texture1D(PREFIX(expansion_curve_tex), x.r).x; x.g = texture1D(PREFIX(expansion_curve_tex), x.g).x; x.b = texture1D(PREFIX(expansion_curve_tex), x.b).x; return x; }